feat: post markdown content (#692)

## Description
This PR adds support for markdown / quill delta for regular feed posts

## Type of Change
- [x] Bug fix
- [x] New feature
- [ ] Breaking change
- [ ] Refactoring
- [ ] Documentation
- [ ] Chore

## Screenshots (if applicable)
<img width="300" alt="image"
src="https://github.com/user-attachments/assets/378bda29-bf58-42e3-9a26-8d97a16ff3c6"
/>

lib/app/components/text_editor/text_editor.dart

@@ -8,7 +8,7 @@ import 'package:ion/app/components/text_editor/components/custom_blocks/text_edi
 import 'package:ion/app/components/text_editor/components/custom_blocks/text_editor_separator_block/text_editor_separator_block.dart';
 import 'package:ion/app/components/text_editor/components/custom_blocks/text_editor_single_image_block/text_editor_single_image_block.dart';
 import 'package:ion/app/components/text_editor/utils/mentions_hashtags_handler.dart';
-import 'package:ion/app/components/text_editor/utils/quill.dart';
+import 'package:ion/app/components/text_editor/utils/text_editor_styles.dart';
 
 class TextEditor extends ConsumerStatefulWidget {
   TextEditor(
@@ -71,7 +71,7 @@ class TextEditorState extends ConsumerState<TextEditor> {
         ],
         autoFocus: widget.autoFocus,
         placeholder: widget.placeholder,
-        customStyles: getCustomStyles(context),
+        customStyles: textEditorStyles(context),
         floatingCursorDisabled: true,
         customStyleBuilder: (attribute) => customTextStyleBuilder(attribute, context),
       ),

lib/app/components/text_editor/text_editor_preview.dart

@@ -7,18 +7,24 @@ import 'package:flutter_quill/quill_delta.dart';
 import 'package:ion/app/components/text_editor/components/custom_blocks/text_editor_code_block/text_editor_code_block.dart';
 import 'package:ion/app/components/text_editor/components/custom_blocks/text_editor_separator_block/text_editor_separator_block.dart';
 import 'package:ion/app/components/text_editor/components/custom_blocks/text_editor_single_image_block/text_editor_single_image_block.dart';
-import 'package:ion/app/components/text_editor/utils/quill.dart';
+import 'package:ion/app/components/text_editor/utils/text_editor_styles.dart';
 import 'package:ion/app/features/ion_connect/model/media_attachment.dart';
 
 class TextEditorPreview extends HookWidget {
   const TextEditorPreview({
     required this.content,
+    this.enableInteractiveSelection = false,
     this.media,
+    this.maxHeight,
+    this.customStyles,
     super.key,
   });
 
   final Delta content;
+  final bool enableInteractiveSelection;
   final Map<String, MediaAttachment>? media;
+  final DefaultStyles? customStyles;
+  final double? maxHeight;
 
   @override
   Widget build(BuildContext context) {
@@ -35,8 +41,9 @@ class TextEditorPreview extends HookWidget {
         enableSelectionToolbar: false,
         floatingCursorDisabled: true,
         showCursor: false,
-        enableInteractiveSelection: false,
-        customStyles: getCustomStyles(context),
+        enableInteractiveSelection: enableInteractiveSelection,
+        customStyles: customStyles ?? textEditorStyles(context),
+        maxHeight: maxHeight,
         embedBuilders: [
           TextEditorSingleImageBuilder(media: media),
           TextEditorSeparatorBuilder(),

lib/app/components/text_editor/utils/build_empty_delta.dart

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: ice License 1.0
+
+import 'package:flutter_quill/quill_delta.dart';
+
+/// Creates new empty delta.
+/// All Quill documents must end with a newline character,
+/// even if there is no formatting applied to the last line.
+///
+/// https://quilljs.com/docs/delta#line-formatting
+Delta buildEmptyDelta() {
+  return Delta()..insert('\n');
+}

lib/app/components/text_editor/utils/is_attributed_operation.dart

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: ice License 1.0
+
+import 'package:flutter_quill/flutter_quill.dart';
+import 'package:flutter_quill/quill_delta.dart';
+
+bool isAttributedOperation(Operation operation, {required Attribute<dynamic> attribute}) {
+  final attributes = operation.attributes;
+  if (attributes == null) return false;
+  return attributes.containsKey(attribute.key);
+}

lib/app/components/text_editor/utils/quill.dart → lib/app/components/text_editor/utils/text_editor_styles.dart

@@ -5,11 +5,12 @@ import 'package:flutter_quill/flutter_quill.dart';
 import 'package:ion/app/components/text_editor/attributes.dart';
 import 'package:ion/app/extensions/extensions.dart';
 
-DefaultStyles getCustomStyles(BuildContext context) {
+DefaultStyles textEditorStyles(BuildContext context, {Color? color}) {
+  final textColor = color ?? context.theme.appColors.secondaryText;
   return DefaultStyles(
     paragraph: DefaultTextBlockStyle(
       context.theme.appTextThemes.body2.copyWith(
-        color: context.theme.appColors.secondaryText,
+        color: textColor,
       ),
       HorizontalSpacing.zero,
       VerticalSpacing.zero,
@@ -18,11 +19,11 @@ DefaultStyles getCustomStyles(BuildContext context) {
     ),
     bold: context.theme.appTextThemes.body2.copyWith(
       fontWeight: FontWeight.bold,
-      color: context.theme.appColors.secondaryText,
+      color: textColor,
     ),
     italic: context.theme.appTextThemes.body2.copyWith(
       fontStyle: FontStyle.italic,
-      color: context.theme.appColors.secondaryText,
+      color: textColor,
     ),
     placeHolder: DefaultTextBlockStyle(
       context.theme.appTextThemes.body2.copyWith(
@@ -44,7 +45,7 @@ DefaultStyles getCustomStyles(BuildContext context) {
     ),
     lists: DefaultListBlockStyle(
       context.theme.appTextThemes.body2.copyWith(
-        color: context.theme.appColors.secondaryText,
+        color: textColor,
         fontSize: context.theme.appTextThemes.body2.fontSize,
       ),
       HorizontalSpacing.zero,

lib/app/features/chat/community/channel/views/pages/channel_page/channel_messaging_page.dart

@@ -2,6 +2,7 @@
 
 import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
+import 'package:flutter_quill/quill_delta.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:ion/app/components/button/button.dart';
 import 'package:ion/app/components/screen_offset/screen_side_offset.dart';
@@ -144,8 +145,8 @@ class _ActionButton extends HookConsumerWidget {
       return MessagingBottomBar(
         onSubmitted: (content) async {
           await ref.read(createPostNotifierProvider(CreatePostOption.community).notifier).create(
-                content: content ?? '',
-                communtiyId: communityId,
+                content: content != null ? (Delta()..insert('$content\n')) : null,
+                communityId: communityId,
               );
         },
       );

lib/app/features/chat/e2ee/model/entites/private_direct_message_data.c.dart

@@ -12,8 +12,6 @@ import 'package:ion/app/features/ion_connect/model/entity_data_with_media_conten
 import 'package:ion/app/features/ion_connect/model/media_attachment.dart';
 import 'package:ion/app/features/ion_connect/model/related_event.c.dart';
 import 'package:ion/app/features/ion_connect/model/related_pubkey.c.dart';
-import 'package:ion/app/services/text_parser/model/text_match.c.dart';
-import 'package:ion/app/services/text_parser/text_parser.dart';
 import 'package:ion/app/services/uuid/uuid.dart';
 
 part 'private_direct_message_data.c.freezed.dart';
@@ -66,7 +64,7 @@ class PrivateDirectMessageEntity with _$PrivateDirectMessageEntity {
 @freezed
 class PrivateDirectMessageData with _$PrivateDirectMessageData, EntityDataWithMediaContent {
   const factory PrivateDirectMessageData({
-    required List<TextMatch> content,
+    required String content,
     required Map<String, MediaAttachment> media,
     required String uuid,
     String? relatedGroupImagePath,
@@ -77,12 +75,10 @@ class PrivateDirectMessageData with _$PrivateDirectMessageData, EntityDataWithMe
   }) = _PrivateDirectMessageData;
 
   factory PrivateDirectMessageData.fromEventMessage(EventMessage eventMessage) {
-    final parsedContent = TextParser.allMatchers().parse(eventMessage.content);
-
     final tags = groupBy(eventMessage.tags, (tag) => tag[0]);
 
     return PrivateDirectMessageData(
-      content: parsedContent,
+      content: eventMessage.content,
       media: EntityDataWithMediaContent.parseImeta(tags[MediaAttachment.tagName]),
       relatedSubject: tags[RelatedSubject.tagName]?.map(RelatedSubject.fromTag).singleOrNull,
       relatedPubkeys: tags[RelatedPubkey.tagName]?.map(RelatedPubkey.fromTag).toList(),
@@ -94,10 +90,8 @@ class PrivateDirectMessageData with _$PrivateDirectMessageData, EntityDataWithMe
   }
 
   factory PrivateDirectMessageData.fromRawContent(String content) {
-    final parsedContent = TextParser.allMatchers().parse(content);
-
     return PrivateDirectMessageData(
-      content: parsedContent,
+      content: content,
       media: {},
       uuid: generateUuid(),
     );
@@ -116,14 +110,13 @@ class PrivateDirectMessageData with _$PrivateDirectMessageData, EntityDataWithMe
     ];
 
     final createdAt = DateTime.now();
-    final contentString = content.map((match) => match.text).join();
 
     final kind14EventId = EventMessage.calculateEventId(
       publicKey: pubkey,
       createdAt: createdAt,
       kind: PrivateDirectMessageEntity.kind,
       tags: eventTags,
-      content: contentString,
+      content: content,
     );
 
     return EventMessage(
@@ -132,7 +125,7 @@ class PrivateDirectMessageData with _$PrivateDirectMessageData, EntityDataWithMe
       createdAt: createdAt,
       kind: PrivateDirectMessageEntity.kind,
       tags: eventTags,
-      content: contentString,
+      content: content,
       sig: null,
     );
   }

lib/app/features/chat/recent_chats/views/pages/recent_chats_timeline_page/recent_chats_timeline_page.dart

@@ -215,9 +215,8 @@ class EncryptedGroupRecentChatTile extends HookConsumerWidget {
       avatarWidget: groupImageFile != null ? Image.file(groupImageFile) : null,
       defaultAvatar: Assets.svg.iconChannelEmptychannel.icon(size: 40.0.s),
       lastMessageAt: conversation.latestMessage?.createdAt ?? conversation.joinedAt,
-      lastMessageContent: entity.content.isEmpty
-          ? context.i18n.empty_message_history
-          : entity.content.map((e) => e.text).join(),
+      lastMessageContent:
+          entity.content.isEmpty ? context.i18n.empty_message_history : entity.content,
       unreadMessagesCount: unreadMessagesCount.valueOrNull ?? 0,
       onTap: () {
         ConversationRoute(conversationId: conversation.conversationId).push<void>(context);

lib/app/features/chat/views/components/message_items/message_types/text_message/text_message.dart

@@ -59,7 +59,7 @@ class TextMessage extends HookConsumerWidget {
                     crossAxisAlignment: CrossAxisAlignment.start,
                     children: [
                       Text(
-                        entity.data.content.map((e) => e.text).join(),
+                        entity.data.content,
                         style: context.theme.appTextThemes.body2.copyWith(
                           color: isMe
                               ? context.theme.appColors.onPrimaryAccent

lib/app/features/feed/create_post/providers/create_post_notifier.c.dart

@@ -1,6 +1,10 @@
 // SPDX-License-Identifier: ice License 1.0
 
 import 'package:collection/collection.dart';
+import 'package:flutter_quill/flutter_quill.dart';
+import 'package:flutter_quill/quill_delta.dart';
+import 'package:ion/app/components/text_editor/utils/build_empty_delta.dart';
+import 'package:ion/app/components/text_editor/utils/extract_tags.dart';
 import 'package:ion/app/exceptions/exceptions.dart';
 import 'package:ion/app/features/core/model/media_type.dart';
 import 'package:ion/app/features/core/providers/env_provider.c.dart';
@@ -32,10 +36,8 @@ import 'package:ion/app/features/ion_connect/providers/ion_connect_notifier.c.da
 import 'package:ion/app/features/ion_connect/providers/ion_connect_upload_notifier.c.dart';
 import 'package:ion/app/services/compressor/compress_service.c.dart';
 import 'package:ion/app/services/logger/logger.dart';
+import 'package:ion/app/services/markdown/quill.dart';
 import 'package:ion/app/services/media_service/media_service.c.dart';
-import 'package:ion/app/services/text_parser/model/text_match.c.dart';
-import 'package:ion/app/services/text_parser/model/text_matcher.dart';
-import 'package:ion/app/services/text_parser/text_parser.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 
 part 'create_post_notifier.c.g.dart';
@@ -46,34 +48,33 @@ class CreatePostNotifier extends _$CreatePostNotifier {
   FutureOr<void> build(CreatePostOption createOption) {}
 
   Future<void> create({
-    required String content,
+    Delta? content,
     WhoCanReplySettingsOption whoCanReply = WhoCanReplySettingsOption.everyone,
     EventReference? parentEvent,
     EventReference? quotedEvent,
     List<MediaFile>? mediaFiles,
-    String? communtiyId,
+    String? communityId,
   }) async {
     state = const AsyncValue.loading();
 
     state = await AsyncValue.guard(() async {
-      final parsedContent = TextParser.allMatchers().parse(content.trim());
-
+      final postContent = content ?? buildEmptyDelta();
       final parentEntity = parentEvent != null ? await _getParentEntity(parentEvent) : null;
       final (:files, :media) = await _uploadMediaFiles(mediaFiles: mediaFiles);
 
       final postData = ModifiablePostData(
-        content: _buildContentWithMediaLinks(content: parsedContent, media: media.values.toList()),
+        content: _buildContentWithMediaLinks(content: postContent, media: media.values.toList()),
         media: media,
         replaceableEventId: ReplaceableEventIdentifier.generate(),
         publishedAt: _buildEntityPublishedAt(),
         editingEndedAt: _buildEntityEditingEndedAt(),
-        relatedHashtags: _buildRelatedHashtags(parsedContent),
+        relatedHashtags: extractTags(postContent).map((tag) => RelatedHashtag(value: tag)).toList(),
         quotedEvent: quotedEvent != null ? _buildQuotedEvent(quotedEvent) : null,
         relatedEvents: parentEntity != null ? _buildRelatedEvents(parentEntity) : null,
         relatedPubkeys: parentEntity != null ? _buildRelatedPubkeys(parentEntity) : null,
         settings: EntityDataWithSettings.build(whoCanReply: whoCanReply),
         expiration: _buildExpiration(),
-        communityId: communtiyId,
+        communityId: communityId,
       );
 
       await _sendPostEntities([...files, postData]);
@@ -88,14 +89,14 @@ class CreatePostNotifier extends _$CreatePostNotifier {
   }
 
   Future<void> modify({
-    required String content,
     required EventReference eventReference,
+    Delta? content,
     WhoCanReplySettingsOption? whoCanReply,
   }) async {
     state = const AsyncValue.loading();
 
     state = await AsyncValue.guard(() async {
-      final parsedContent = TextParser.allMatchers().parse(content.trim());
+      final postContent = content ?? buildEmptyDelta();
       final modifiedEntity =
           await ref.read(ionConnectEntityProvider(eventReference: eventReference).future);
       if (modifiedEntity is! ModifiablePostEntity) {
@@ -104,10 +105,10 @@ class CreatePostNotifier extends _$CreatePostNotifier {
 
       final postData = modifiedEntity.data.copyWith(
         content: _buildContentWithMediaLinks(
-          content: parsedContent,
+          content: postContent,
           media: modifiedEntity.data.media.values.toList(),
         ),
-        relatedHashtags: _buildRelatedHashtags(parsedContent),
+        relatedHashtags: extractTags(postContent).map((tag) => RelatedHashtag(value: tag)).toList(),
         settings: EntityDataWithSettings.build(
           whoCanReply: whoCanReply ?? modifiedEntity.data.whoCanReplySetting,
         ),
@@ -130,7 +131,7 @@ class CreatePostNotifier extends _$CreatePostNotifier {
       }
 
       final postData = entity.data.copyWith(
-        content: [const TextMatch('')],
+        content: '',
         editingEndedAt: null,
         relatedHashtags: [],
         relatedPubkeys: [],
@@ -217,22 +218,18 @@ class CreatePostNotifier extends _$CreatePostNotifier {
     };
   }
 
-  List<TextMatch> _buildContentWithMediaLinks({
-    required List<TextMatch> content,
+  String _buildContentWithMediaLinks({
+    required Delta content,
     required List<MediaAttachment> media,
   }) {
-    return [
-      if (media.isNotEmpty) TextMatch(media.map((attachment) => attachment.url).join(' ')),
-      if (media.isNotEmpty && content.isNotEmpty) const TextMatch(' '),
-      ...content,
-    ];
-  }
-
-  List<RelatedHashtag> _buildRelatedHashtags(List<TextMatch> content) {
-    return [
-      for (final match in content)
-        if (match.matcher is HashtagMatcher) RelatedHashtag(value: match.text),
-    ];
+    final contentWithMedia = Delta.fromOperations(
+      media
+          .map(
+            (mediaItem) => Operation.insert(mediaItem.url, {Attribute.link.key: mediaItem.url}),
+          )
+          .toList(),
+    ).concat(content);
+    return deltaToMarkdown(contentWithMedia);
   }
 
   List<RelatedEvent> _buildRelatedEvents(IonConnectEntity parentEntity) {

lib/app/features/feed/create_post/views/components/post_submit_button/post_submit_button.dart

@@ -5,7 +5,6 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:flutter_quill/flutter_quill.dart';
-import 'package:flutter_quill/quill_delta.dart';
 import 'package:go_router/go_router.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:ion/app/components/text_editor/hooks/use_text_editor_has_content.dart';
@@ -72,9 +71,6 @@ class PostSubmitButton extends HookConsumerWidget {
     return ToolbarSendButton(
       enabled: isSubmitButtonEnabled,
       onPressed: () async {
-        final operations = textEditorController.document.toDelta().operations;
-        final content = Document.fromDelta(Delta.fromOperations(operations)).toPlainText();
-
         if (modifiedEvent != null) {
           unawaited(
             ref
@@ -84,7 +80,7 @@ class PostSubmitButton extends HookConsumerWidget {
                   ).notifier,
                 )
                 .modify(
-                  content: content,
+                  content: textEditorController.document.toDelta(),
                   eventReference: modifiedEvent!,
                   whoCanReply: whoCanReply,
                 ),
@@ -101,7 +97,7 @@ class PostSubmitButton extends HookConsumerWidget {
                   ).notifier,
                 )
                 .create(
-                  content: content,
+                  content: textEditorController.document.toDelta(),
                   parentEvent: parentEvent,
                   quotedEvent: quotedEvent,
                   mediaFiles: convertedMediaFiles,